Ghost was correct about toyota bein NON- Interference engines, unless you have an LX90 chaser/cresta/mk2 with the 2L-TE diesel engine i would not worry about your valves meeting with the piston... unless they drop of course
Other interference engines include:
B, 2B, 3B, 11B, 13B, 13B-T, 14B, 15B
L, 2L, 3L, 5L
C, 2C, 3C-T
1HZ, 1HD-T, 1HD-FTE
Im sure there are some other variations but that just about covers the main ones.
I didn't realize that the 3B does not have a timing belt or chain assembly so that makes me feel better.